The concept and doctrine is found not only in the parallels of Romans 5 as previously referenced, but also in the parallels of 1 Corinthians 15 as here:where in scripture do you find the idea or concept of Adam as our represenatative, And what doe that mean?
1Co 15:21-22 For since by man came death, by man came also the resurrection of the dead. (22) For as in Adam all die, even so in Christ shall all be made alive.
1Co 15:45-49 And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit. (46) Howbeit that was not first which is spiritual, but that which is natural; and afterward that which is spiritual. (47) The first man is of the earth, earthy: the second man is the Lord from heaven. (48) As is the earthy, such are they also that are earthy: and as is the heavenly, such are they also that are heavenly. (49) And as we have borne the image of the earthy, we shall also bear the image of the heavenly.